Yes, of course organized fights are illegal outside licensed venues. And there's the fact that this would just provide the police with the persons name and location, and the location of the fight. But as a spectator this would be interesting.
Fight and meet them all in one spot then just dip, all fight each other. Set up a camera and get a good show out of it.
Then lock them in a room and say 'would you like to play a game?' and up the stakes.
Then lock them in a room and say 'would you like to play a game?' and up the stakes.